How Dawn theme decide the layout of the 3 column grid announcement bar?

[YuhangWang]

I'm learning Dawn and have a question on where it generate the 

grid-template-areas: 'social-icons announcements language-currency';

In base.css it is like this:

@media screen and (min-width: 990px) {

  .utility-bar__grid--3-col {

    grid-template-columns: 3fr 4fr 3fr;

    grid-template-areas: 'social-icons announcements language-currency';

  }

So in announcement-bar.liquid, for example, 'social-icons' must be generated, however, there is only this:

    {%- if section.settings.show_social and social_icons -%}

      {%- render 'social-icons' -%}

    {%- endif -%}

And I did not see 'social-icons' generation in the social-icons.liquid snippet as well.

I want to know how or why.

[Made4uo-Ribe]

Hi @YuhangWang 

Would you mind to share your store URL? Thanks!